RYBKA

American-Hungarian computer software program by Vasik Rajlich, which was the highest world-ranked among computer software in 2007 through 2010.

Its successes included the sixteenth International Paderborn Computer Chess Championship in 2006 and the Dutch Computer Championship in 2006. In 2007, it succeeded in a match with Ehlvest, the Leiden Computer Tournament at the World Computer Championship in Amsterdam, in 2008 the Leiden Computer Tournament at the World Championship in Beijing. In 2007 in Mexico in an exhibition match, Rybka lost to Zappa 4.5-5.5.  Rybka succeeded in winning the World Computer Championship in 2009 and in 2010.

On June 28, 2011, the International Computer Games Association (ICGA) concluded their investigation and determined that Vasik Rajlich in programming Rybka had plagiarized two other chess software programs: Crafty and Fruit. The ICGA sanction for Vasik Rajlich and Rybka was the disqualification from the World Computer Chess Championship (WCCC) of 2006, 2007, 2008, 2009 and 2010. Vasik Rajlich is banned for life from competing in the WCCC or any other event organized by or sanctioned by the ICGA.

Rybka (Computer) vs Jaan Ehlvest 1-0
2007.03.06

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Qd3 Nbd7 6. cxd5 exd5 7. Bf4 Be7 8. O-O-O g6 9. e3 a5 10. Qc2 Nf8 11. Bd3 Be6 12. Kb1 a4 13. Nxa4 Qa5 14. b3 Bg4 15. Nc5 Qa7 16. Rdg1 Ne6 17. Nxe6 Bxe6 18. Be5 h6 19. Ng5 Kd7 20. Nxe6 Kxe6 21. g4 Bd6 22. f4 Ke7 23. Bxf6+ Kxf6 24. Rxh6 Kg7 25. g5 Rxh6 26. gxh6+ Kh8 27. Bxg6 1-0